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Structural Engineering and Mechanics Volume 78, Number 3, May10 2021 , pages 369-378 DOI: https://doi.org/10.12989/sem.2021.78.3.369 |
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Output only system identification using complex wavelet modified second order blind identification method - A time-frequency domain approach |
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Chaojun Huang and Satish Nagarajaiah
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| Abstract | ||
| This paper reviewed a few output-only system identification algorithms and identified the shortcomings of those popular blind source separation methods. To address the issues such as less sensors than the targeted modal modes (under-determinate problem), repeated natural frequencies as well as systems with complex mode shapes, this paper proposed a complex wavelet modified second order blind identification method (CWMSOBI) by transforming the time domain problem into time-frequency domain. The wavelet coefficients with different dominant frequencies can be used to address the under-determinate problem, while complex mode shapes are addressed by introducing the complex wavelet transformation. Numerical simulations with both high and low signal-to-noise ratios validate that CWMSOBI can overcome the above-mentioned issues while obtaining more accurate identified results than other blind identification methods. | ||
| Key Words | ||
| system identification; second order blind identification; blind source separation; complex wavelet modified SOBI; wavelet transform; time-frequency domain | ||
| Address | ||
| Chaojun Huang: Research & Development Institute, China Merchant Industry, Shenzhen, Guangdong, China; Department of Civil & Environmental Engineering, Rice University, Houston, Texas-77005, USA Satish Nagarajaiah: Department of Civil & Environmental Engineering, Rice University, Houston, Texas-77005, USA; Department of Mechanical Engineering, Rice University, Houston, Texas-77005, USA | ||